Prevention from Wild and Hostile Ideas

How can I avoid being attacked by these wild and hostile ideas?

You must learn to reject them when they come.

Not to come into contact with the people who carry them?

That is impossible—there would be too many people to avoid.

But the point is to know who is carrying them?

That is impossible by any outer method; it is only by acquiring an inner discrimination that these things can be known.

Ref : More Answers from The Mother